void main(List<String> args) {
  // 1.基础for循环
  for (int i = 0; i < 10; i++) {
    print(i);
  }
  // 便利数组
  var names = ["11", "22", "33", "44"];
  for (int i = 0; i < names.length; i++) {
    print(names[i]);
  }
  for (var item in names) {
    print(item);
  }
}
